US1745525A - Apparatus for machining valves, etc. - Google Patents

Description

Feb. 4, 1930. R. w. BlssELL 1,745,525

APPARATUS FOR MACHINING VALVES, 'ETC I Filed June 19, 1925 411/ v gulli ATTORNEY IN VEN TOR.

Patented vFeb. 4,1930

- unimo STATES PATENT OFFICE ROBERT BISSLL, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO KEROTEST MAN- UFACTURING COMPANY, F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA APPARATUS FOR MACHINING VALVES, ETC.

Application led .Tune 19, 1925. Serial No. 38,173.

perpendicular to the longitudinal axis of the valve. This means that when the Valve is set up in a lathe', or other machine, with its longitudinal axis coincident with the axis of rotation of the lathe, the valve seats,`or seat ring receiving parts of the -Valve cannot be machined as such seats have a lgyratory motion with respect to the tool.

The usual practice, therefor, in machining such valves is to mount the casting in a lathe and machine the square faces of the valve.

Then a Wedge plate is put against the face plate of the lathe, an'd the casting properly set on the wedge plate to machine one of the valve seats. Then the valve is removed, re-

versed, end for end, and Vagain set up on the wedge plate in proper position to machine the other valve seat. The settin up of the valve on the wedge plate must e very accurately and carefully done. This requires 3o extremely careful measuring in order to prevent error, and consequentlyT consumes a great deal of time. With large heavy valves, it is especially a difficult and time consuming work.

According to the present invention, it is proposed to provide a method and apparatus, whereby, after the s uare surface of the valve has been machine the valve can be set up in a lathe, or other machine, and one valve seat quickly finished and then, by a slight adjustment, the other seat can be machined and finished.

The present invention may be considered as a modification of thev method and apparatus disclosed in my co-pending application,

Serial Number 38,172, filed June 19, 1925.

The nature of the invention ma be readily understood by reference to t e accompanying drawing, in which: v

504 Fig.1 is a longitudinal section through a lathe attachment embodying my invention and showing a valve in position thereon for the machining of the valve seatnearest the face plate.

Fig. 2 is a similar view showing the valve shifted to a position to machine the seat remote from the face plate.

Fig. 3 is a front View of the device with the valve removed.

Fig. 4 is a detail view of a connection between the face plate and a part of the valve holder.

In the drawings, 5 designates the revolving shaft of a lathe or other suitable machine. At its terminal is the hub 6 of a face plate 7. It will be noted that the face plate is not perpendicular to the axis of the shaft, but is angularly offset with respect thereto, the degree of inclination from a perpendicular plane corresponding to the degree of inclination of the valve seats.

Fitted over the face plate, but rotatable thereon, is a flanged intermediate plate 8. On the front face ofthis plate is a diametrical groove 9. The fro-nt and rear surfaces of said intermediate plate are in parallelism. The plate may be retained in place by bolts 10 having T-heads 11 that hook over the back of the said face plate. Nuts 10 are provided on the bolts for tightening or loosening them.

On the' front of thelanged plate isa hase plate 12 having a rib 13 which is fitted into the groove 9. This plate may be shifted transversely of the flanged plate, as it isadjustably secured thereto b bolts 14 on late 8 passing through slots 15 1n said base p ate. Nuts 14 are threaded on said bolts.

In the front of the base plate 12 is the circular'foot 16 of a screw plug 17. Clamps 18 also secured in place bv bolts 14 and nuts 14a extend over the foot of the plug. Secured to the base plate by bolts and nuts 19 is a yoke, having a foot 20 which is slotted to receive the bolts, and which has arms 21 between which the valve A is disposed to facilitate the mounting of the valve.

In using the apparatus, the square faces of the valve are machine finished, and the end passages threaded so that all that is further necessary is the turning of the seats. The

plug 17, which is removed from the base plate, is screwed tightly into one ofthe threaded ends of the valve. The plug with the attached valve is then clamped on the base plate with the T of the valve disposed between the arms of the yoke, and the yoke clamped in the proper position. At this time,

the flanged plate is so mounted on the face plate that one ofthe valve seats, say seat a is in a plane perpendicular to the axis of rotation While'the valve body is generally inclined to the axis of rotation, as clearly shown in Fig. 1, where X--X is the axis of rotation and. line Y-Y is the axis of the valve.

AAs the longitudinal axis of the valve is then 'excentric to the axis of rotation, it is necthrough the open end of the valve until seat a has been machined, as shown in Fig. 1.

When this has been done, bolts 10 may 'be loosened and the flanged plate rotated exactly 180 and the bolts 10 again tightened. This throws the other seat, a2 into -a plane perpendicular to the axis of rotation, but throws the center of symmetry of the valve considerably to one side ofthe axis of rotation. The base plate is then shifted in an opposite directionuntil the longitudinal axis of the valve intersects the axis of rotation in the lane of the seat a2,this point of intersection eing designated s. -The parts are then tightened, and the seat a2 machined. The value or necessity of havin the plug v12 separate from the base plate willfbe appreciated when it is understood that thethreads on the plug and valve willtake up on different val-ves to different positions. Consequent1y,were the plug inte ral with the base dH7 tightly into the' i valve, as is the plug 17, there is no assurance plate, and were it .screwe that in different valves, the angles of the valve seats would be properly disposed with res ect to the angular surface of the face pla e, with the conse uence that the lateral shifting of the base 'p ate, or the rotation of the lflanged platevonfthe faceplate, would not bring the seats ofthe different valves into the proper position or angle.

vFrom the 'foregoing it will be seen that after the valve is oncev mounted, and this can be quite easil done, the valve does not need' to be taken o the lathe or other machine until both seats have been completed. It will also be seen, that even if a slight error is made in initially setting the valve up, that both seats will retain the same inclination with respect to `each other.

While I have specifically shown and described one particular construction of apparatus, it will ,be understood that this is meref ly by way of illustration, and that various changes and modications may be made therein within the contemplation of the invention and under the scope of the appended claims. While I have particularly described the invention as applying to the machining of gate Valves of the Wedge-gate type, itwill be obvious ythat the principal of the invention may be adapted to the machining lof other articles than valves and can be used in connection Withother machine-tools than lathes.

I claim as my invention:

1. A device for inishing'valves or the like, in combination with a face plate adapted for rotation having an angular face, an intermediate plate having substantially -parallel surfaces, bolts to hook over the face plate to secure both of said platesl together with said vface and one of said surfaces in contact and permitting one of the plates to be turned to vary the relative positions of the plates, and a base plate having a radial rib adjustably interttted in the other of said surfaces, said base plate having a central recess to accommodate a valve-securing member.

2. A device for 'finishing valves and the lilie, in combination with a Aface plate adapted for rotation having an angular face, an intermediate plate having Asubstantially paral lel surfaces and an annular flange to surround said face plate, said intermediate plate being rotatable relatively to the face ,plate for adj ustment and having a radial slot, a base' plate having a radial rib adjustably disposed in said slot, said base plate having a recess to receive a valve-carried part, clamps on the intermediate plate to overlap said base plate and slot, an element on the base plate having arms to facilitate mounting of a valve, and means carried bythe intermediate plate for datachable hooking engagement with the face p ate. Y

In testimony whereof I ailix my signature.

ROBERT W. BISSELL.

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